We have a chicken and egg problem: validation of DNSSEC signatures doesn't work without a correct clock, but to set the correct clock we need to contact NTP servers which requires resolving a hostname, which would normally require DNSSEC validation. Let's break the cycle by excluding NTP hostname resolution from validation for now. Of course, this leaves NTP traffic unprotected. To cover that we need NTPSEC support, which we can add later. Fixes: #5873 #15607
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